Fathabad () is a village in Eresk Rural District of Eresk District, Boshruyeh County, South Khorasan province, Iran.
At the time of the 2006 National Census, the village's population was 378 in 104 households, when it was in the former Boshruyeh District of Ferdows County. The following census in 2011 counted 344 people in 104 households, by which time the district had been separated from the county in the establishment of Boshruyeh County. The rural district was transferred to the new Eresk District. The 2016 census measured the population of the village as 317 people in 105 households. It was the most populous village in its rural district.